*puts SEO hat on*
For https redirects, make sure you force https using .htaccess, you then want to go into webmaster tools and set your site preference to https/www (or non-www).
All content served on the page should be from https sources. This includes style sheets, images and videos. Your page won't be considered secure otherwise (and for good reason).
You may see a reduction in traffic, but it's better to get it done as soon as possible. There's no reason not to have every website https, and plenty of reasons to have them all https.
It will give you an SEO boost. non-secure websites are on their way out.
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